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Author Topic: New MS-261CM hard starting when hot  (Read 1642 times)

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Offline axeman2021

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Re: New MS-261CM hard starting when hot
« Reply #20 on: May 03, 2021, 09:00:16 AM »
On this recent ph call I asked dealer about the coil breaking down as a possible cause-he said the coil on an M-tronic saw is tied into the M-tronic system, as if it's not a simple one part diagnosis. Honestly I was ready to fetch the saw and take to another dealer but decided it made no sense as he says he's catching up on repairs now after several truckloads of mower assemblies/sales and I have my tractor dead-ended at another shop anyway.    
Here is a online video of replacing the M-tronic coil on the Sthil CM261C-M give it a look, and maybe you could just buy the coil and install it yourself.

vide of replacing the coil on a Stihl M-tronic CM261 C-M chainsaw - Bing video

But the main thing is getting the new fuel filter and new coil on your saw.

Offline kantuckid

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Re: New MS-261CM hard starting when hot
« Reply #21 on: May 03, 2021, 09:54:34 AM »
Thanks but the youtube video is for a straight 261, not an MS-261CM -> M-tronic saw.  My dealers reply was to suggest that it's throwing on parts with my saw to simply replace the coil as a stand alone part. No, I am not in the know on a chipped, non adjustable carb saw and will leave it to the dealer to diagnose.  
Kan=Kansas;tuck=Kentucky;kid=what I'm not

Offline axeman2021

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Re: New MS-261CM hard starting when hot
« Reply #22 on: May 03, 2021, 10:14:18 AM »
Thanks but the youtube video is for a straight 261, not an MS-261CM -> M-tronic saw.  My dealers reply was to suggest that it's throwing on parts with my saw to simply replace the coil as a stand alone part. No, I am not in the know on a chipped, non adjustable carb saw and will leave it to the dealer to diagnose.  
Good Luck.

Offline Tacotodd

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Re: New MS-261CM hard starting when hot
« Reply #23 on: May 03, 2021, 05:09:43 PM »
As it stands with my M-tronic saw I'd certainly go for some carb screws. Both carb with screws and fuel injection I can work on OK. M-tronic requires a Stihl dealer. My dealer has bad feet, a one man show with his wife and had it for over 6 weeks now. After I heard his multiple foot doc visits story (I really empathize with the working man who has health issues! as there's no free lunches for them) added to his overwhelming mower sales from JB bucks throw in my tractors clutch went out and I decided to stick with him.

But the old FI stories are true as are the computerized engines stories.  My OBD device doesn't work on my chainsaw. :D


My OBDII doesnt fit either, oh well.
Trying harder everyday.

Offline axeman2021

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Re: New MS-261CM hard starting when hot
« Reply #24 on: May 03, 2021, 05:59:50 PM »
As it stands with my M-tronic saw I'd certainly go for some carb screws. Both carb with screws and fuel injection I can work on OK. M-tronic requires a Stihl dealer. My dealer has bad feet, a one man show with his wife and had it for over 6 weeks now. After I heard his multiple foot doc visits story (I really empathize with the working man who has health issues! as there's no free lunches for them) added to his overwhelming mower sales from JB bucks throw in my tractors clutch went out and I decided to stick with him.

But the old FI stories are true as are the computerized engines stories.  My OBD device doesn't work on my chainsaw. :D


My OBDII doesnt fit either, oh well.
As i have posted to other forum members with problems with their Stihl M-tronic saws, try running the calibration process on your Stihl  M-tronic saws.

Offline doc henderson

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Re: New MS-261CM hard starting when hot
« Reply #25 on: May 03, 2021, 08:16:21 PM »
I had tried that with each start and made no difference with mine.  I think that is the difference between a working M-tronic and a non working one.  good thoughts. 
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Offline kantuckid

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Re: New MS-261CM hard starting when hot
« Reply #26 on: May 04, 2021, 01:59:28 PM »
To finish up my comments toward my MS-241 CM M-Tronic saws issues: Dealer just called me and my saws ready for pickup. Essential to the repair is the Stihl program for your model & a laptop and of course, the saw itself. You cannot throw parts at these saws if the motronics involved in the issue. it might be useless plus expensive. 
He said it was running too rich to idle properly-was due to a faulty solenoid valve. Running rich makes sense as it had begun to show more oil/smoke from the exhaust as it also began to idle poorly and get balky, plus hard to start hot. He replaced the spark plug on logic due to it running rich for awhile. He also said that he could see the fuel filter had collected some stopage material and replaced it too. As I'd mentioned, before he's seen a number of these newer saws that had filter issues.  The motronic filters are not dangling on tubing as was before.
Now, if I had a tractor and it would stop raining every day... :'( 
Kan=Kansas;tuck=Kentucky;kid=what I'm not

Offline axeman2021

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Re: New MS-261CM hard starting when hot
« Reply #27 on: May 04, 2021, 03:35:34 PM »
To finish up my comments toward my MS-241 CM M-Tronic saws issues: Dealer just called me and my saws ready for pickup. Essential to the repair is the Stihl program for your model & a laptop and of course, the saw itself. You cannot throw parts at these saws if the motronics involved in the issue. it might be useless plus expensive.
He said it was running too rich to idle properly-was due to a faulty solenoid valve. Running rich makes sense as it had begun to show more oil/smoke from the exhaust as it also began to idle poorly and get balky, plus hard to start hot. He replaced the spark plug on logic due to it running rich for awhile. He also said that he could see the fuel filter had collected some stopage material and replaced it too. As I'd mentioned, before he's seen a number of these newer saws that had filter issues.  The motronic filters are not dangling on tubing as was before.
Now, if I had a tractor and it would stop raining every day... :'(
That is really good news and glad you have a Sthil dealer that really tried to get the saw fixed, also this gives a lot more insight as to the  the problems these saws have and what it takes to fix them.

Offline Jim Chance

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Re: New MS-261CM hard starting when hot
« Reply #28 on: June 20, 2021, 10:29:26 AM »
So both saws (261m, 201m) are much better since I got rid of that batch of fuel. No longer have the vapor lock issues. The 261 is fine. The 201 is still a little persnickety. Bleeping the throttle on a cold start often kills it. I have to disengage the brake on fast idle and blow it out a bit to get it to behave. I am also beginning to think I am better off not putting it in start once it is warm but it instead starting it in run despite what the manual says. The calibration procedure on the 201 seems to help if it starts misbehaving. On the 261, which has an older version of mtronic and a different procedure, not so much. Altogether I would prefer if they were non-M, but they are ok with the better gas.

Offline doc henderson

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Re: New MS-261CM hard starting when hot
« Reply #29 on: June 20, 2021, 05:35:39 PM »
I always start my warm saws in run. :)
timberking B 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor 12 volt tarp motor

Offline donbj

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Re: New MS-261CM hard starting when hot
« Reply #30 on: June 21, 2021, 02:00:42 AM »
Buy a Husky, problem solved! ;D
I may be skinny but I'm a Husky guy

Woodmizer LT40HDG24. John Deere 5300 4WD with Loader/Forks. Husky 262xp. Jonsered 2065, Husky 65, Husky 44, Husky 181XP, Husky 2100CD, Husky 185CD

Offline axeman2021

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Re: New MS-261CM hard starting when hot
« Reply #31 on: June 21, 2021, 07:51:05 AM »
Like doc Henderson posted use run not choke when saw is hot, if your saw will start cold and you have done the Calibration procedure there is nothing wrong with the saw.

I have found my saws and other 2 cycle tools start and run much better since switching to Red Armor oil in real gas.


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